On Balmer alpha emission in keV collisions between protons and atomic hydrogen

Ermolaev, A M

doi:10.1088/0953-4075/24/20/001

Cited by 15 publications

(11 citation statements)

References 16 publications

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“…Our results are compared in figure 3 with the available experimental data. There is good agreement with the measurements of Detleffsen et al [1], in accordance with the theoretical calculations of [10,[23][24][25]. A stringent test of the theory is provided by the magnetic sublevel population of the excited states.…”

Section: H + + H Collisionssupporting

confidence: 88%

Excitation of atomic hydrogen by protons and multicharged ions

Martı́n¹

1999

J. Phys. B: At. Mol. Opt. Phys.

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We have studied the excitation of an atomic hydrogen by , and ions in the range of intermediate and high impact velocities, v = 1-7 au. The theoretical method is based on a one-centre close-coupling expansion of the time-dependent wavefunction, which includes a discretized representation of the ionization continuum. The calculated cross sections are in very good agreement with the available experimental measurements up to n = 6. In contrast, some discrepancies are observed for dipole-forbidden transitions when comparing with previous theoretical data. The results show the validity of the Janev-Presnyakov scaling law for both optically-allowed and forbidden excitation transitions.

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Section: H + + H Collisionssupporting

confidence: 88%

Excitation of atomic hydrogen by protons and multicharged ions

Martı́n¹

1999

J. Phys. B: At. Mol. Opt. Phys.

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“…There is good agreement with the measurements of Detleffsen et al [1], in accordance with the theoretical calculations of [10,[23][24][25]. A stringent test of the theory is provided by the magnetic sublevel population of the excited states.…”

Section: H + + H Collisionssupporting

confidence: 88%

“…The two existing experimental works of Detleffsen et al [1] and Donnelly et al [22] differ on the magnitude of the cross section (results from the former experiment are significantly lower). Early theoretical works [23][24][25] are close to the data of Detleffsen et al [1], but a recent threecentre calculation by McLaughlin et al [26] provides higher cross sections and an oscillation that lies between both sets of experimental data. The Balmer-α emission cross section can be expressed in terms of the excitation cross sections to the different l-states of the n = 3 level as…”

Section: H + + H Collisionsmentioning

confidence: 52%

Compact homogeneous manifolds with integrable invariant distributions, and scalar curvature

Berestovskiî¹

1995

Sb. Math.

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We have studied the excitation of an atomic hydrogen by H + , Li 3+ and C 6+ ions in the range of intermediate and high impact velocities, v = 1-7 au. The theoretical method is based on a one-centre close-coupling expansion of the time-dependent wavefunction, which includes a discretized representation of the ionization continuum. The calculated cross sections are in very good agreement with the available experimental measurements up to n = 6. In contrast, some discrepancies are observed for dipole-forbidden transitions when comparing with previous theoretical data. The results show the validity of the Janev-Presnyakov scaling law for both optically-allowed and forbidden excitation transitions.

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“…The only available experimental data for higher n values are measurements by Park et a1 (1976), who investigated the excitation of the H(n=3) level and measurements of the Balmer-a emission cross sections by Donnelly et a1 (1991). The latter data deviate remarkably from the calculations by Shakeshaft (1978) and motivated further recent calculations by Ermolaev (1991) and by Slim (1993). The Balmer-a emission cross section can be expressed by the excitation cross sections of the 1-states of the n= 3 level in the following way:…”

Section: H+-h Collisionsmentioning

confidence: 50%

Excitation of atomic hydrogen by protons and multiply charged ions at intermediate velocities

Detleffsen¹,

Anton²,

Werner³

et al. 1994

J. Phys. B: At. Mol. Opt. Phys.

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We have investigated the collisional excitation of hydrogen atoms by protons and multiply charged ions at intermediate velocities applying the optical method. The population or the np levels (n = 2,. . . ,6) has been determined for a variety of projectiles with charge states q ranging from I + to I I + and scaled velocities U/& between 0.7 and 5.6au. The cross &ions are shown to fulfil the scaling relation o / q = f ( d / q ) with respect to the projectile charge q and velocity U for q>3. The relevan= of scaled intermediate velocities for a classification o f excitation mechanism is pointed out.

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On Balmer alpha emission in keV collisions between protons and atomic hydrogen

Abstract: New close-coupled cross senions for direct excitation of H by proton impact and for Balmer alpha emission are reported. Attention is drawn 10 an apparent disagreement between theoretical and experimental Balmer emission data.

Cited by 15 publications

References 16 publications

Excitation of atomic hydrogen by protons and multicharged ions

Excitation of atomic hydrogen by protons and multicharged ions

Compact homogeneous manifolds with integrable invariant distributions, and scalar curvature

Excitation of atomic hydrogen by protons and multiply charged ions at intermediate velocities

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